MUSITRONICS MU-TRON BI-PHASE & OPTI-POT Accessories and I think the mix

and I think the mix options between the echoes and spring make them more versatile

The mod is activated by a switch

International operation on 100

Cosmetic condition is excellent with only very minor signs of use and age

Some of the knobs are also scuffed but present well

MUSITRONICS MU-TRON BI-PHASE & OPTI-POT Accessories and I think the mixYou're going to need a bigger pedal board for these babies Soundgas present one of the greatest (and biggest) effects pedals ever made the Musitronics Mu tron Bi Phase, together with a C 100 Opti Pot pedal which adds foot control to the phaser sweep. Both in excellent condition, working perfectly and sounding great. Just been serviced calibrated. It's a USA 110v model but has been converted to 240v for UK EU use. The main face is in good overall